/*
 * Java Hexdump Library Copyright (c) Matthew Johnson 2005 This program is free
 * software; you can redistribute it and/or modify it under the terms of the GNU
 * Lesser General Public License as published by the Free Software Foundation,
 * version 2 only. This program is distributed in the hope that it will be
 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 * General Public License for more details. You should have received a copy of
 * the GNU Lesser General Public License along with this program; if not, write
 * to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA. To Contact the author, please email
 * src@matthew.ath.cx
 */

package cx.ath.matthew.utils;

import java.io.PrintStream;

public class Hexdump {
  public static final char[] hexchars = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };

  public static String format(byte[] buf) {
    return format(buf, 80);
  }

  public static String format(byte[] buf, int width) {
    int bs = (width - 8) / 4;
    int i = 0;
    StringBuffer sb = new StringBuffer();
    do {
      for (int j = 0; j < 6; j++) {
        sb.append(hexchars[(i << (j * 4) & 0xF00000) >> 20]);
      }
      sb.append('\t');
      sb.append(toHex(buf, i, bs));
      sb.append(' ');
      sb.append(toAscii(buf, i, bs));
      sb.append('\n');
      i += bs;
    } while (i < buf.length);
    return sb.toString();
  }

  public static void print(byte[] buf) {
    print(buf, System.err);
  }

  public static void print(byte[] buf, int width) {
    print(buf, width, System.err);
  }

  public static void print(byte[] buf, int width, PrintStream out) {
    out.print(format(buf, width));
  }

  public static void print(byte[] buf, PrintStream out) {
    out.print(format(buf));
  }

  public static String toAscii(byte[] buf) {
    return toAscii(buf, 0, buf.length);
  }

  public static String toAscii(byte[] buf, int ofs, int len) {
    StringBuffer sb = new StringBuffer();
    int j = ofs + len;
    for (int i = ofs; i < j; i++) {
      if (i < buf.length) {
        if ((20 <= buf[i]) && (126 >= buf[i])) {
          sb.append((char) buf[i]);
        } else {
          sb.append('.');
        }
      } else {
        sb.append(' ');
      }
    }
    return sb.toString();
  }

  /**
   * Returns a string which can be written to a Java source file as part of a
   * static initializer for a byte array. Returns data in the format 0xAB, 0xCD,
   * .... use like: javafile.print("byte[] data = {")
   * javafile.print(Hexdump.toByteArray(data)); javafile.println("};");
   */
  public static String toByteArray(byte[] buf) {
    return toByteArray(buf, 0, buf.length);
  }

  /**
   * Returns a string which can be written to a Java source file as part of a
   * static initializer for a byte array. Returns data in the format 0xAB, 0xCD,
   * .... use like: javafile.print("byte[] data = {")
   * javafile.print(Hexdump.toByteArray(data)); javafile.println("};");
   */
  public static String toByteArray(byte[] buf, int ofs, int len) {
    StringBuffer sb = new StringBuffer();
    for (int i = ofs; (i < len) && (i < buf.length); i++) {
      sb.append('0');
      sb.append('x');
      sb.append(hexchars[(buf[i] & 0xF0) >> 4]);
      sb.append(hexchars[buf[i] & 0x0F]);
      if (((i + 1) < len) && ((i + 1) < buf.length)) {
        sb.append(',');
      }
    }
    return sb.toString();
  }

  public static String toHex(byte[] buf) {
    return toHex(buf, 0, buf.length);
  }

  public static String toHex(byte[] buf, int ofs, int len) {
    StringBuffer sb = new StringBuffer();
    int j = ofs + len;
    for (int i = ofs; i < j; i++) {
      if (i < buf.length) {
        sb.append(hexchars[(buf[i] & 0xF0) >> 4]);
        sb.append(hexchars[buf[i] & 0x0F]);
        sb.append(' ');
      } else {
        sb.append(' ');
        sb.append(' ');
        sb.append(' ');
      }
    }
    return sb.toString();
  }
}
